Pregnancy Planning Age Calculator
How age affects your chance of conceiving. Free, private and instant.
How to use the Pregnancy Planning Age
- Enter age.
- Enter months already trying (optional) - optional.
- Press Calculate to get an instant result with a colour scale, chart and plain-English explanation.
About the Pregnancy Planning Age
Fertility changes with age. This tool shows the average chance of conceiving each cycle and within a year at your age, miscarriage and chromosomal risk, and when to seek fertility advice, with a chart of fertility by age.
Also known as: fertility by age calculator, chance of pregnancy by age, when to start trying for a baby, age and fertility.
Worked example
- Age: 30 years
Chance of pregnancy each cycle: 20 % (Gradual decline (30-34)). At 30, the average chance of conceiving each cycle is about 20%, and about 93% within a year of regular unprotected sex. Averages vary a lot between individuals.
- Per cycle: 20%
- Within 12 months: 93%
- Miscarriage risk: about 12%
- Down syndrome chance: about 1 in 500
Formula and cut-offs
Per-cycle chance interpolated from published averages (about 25% in the 20s, 20% at 30, 15% at 35, 5% at 40, 1% at 45). 12-month chance = 1 - (1 - p)^12.
Frequently asked questions
How does age affect fertility?
Fertility is highest in the 20s, declines gradually from about 30 and falls faster after 35.
When should I see a doctor?
After 12 months of trying if under 35, after 6 months if 35 to 39, and before trying if 40 or older.
Does male age matter?
Yes. Sperm quality and conception time are also affected by age, though more gradually.
What is the chance of pregnancy each cycle for a 30-year-old?
Chance of pregnancy each cycle: 20 % (Gradual decline (30-34)). At 30, the average chance of conceiving each cycle is about 20%, and about 93% within a year of regular unprotected sex. Averages vary a lot between individuals. Enter your own numbers above for a personal result.
Sources and references
Written and checked by the MediHub editorial team against the sources above. Read how we build and review our calculators.
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Last updated . This calculator is for education only and is not medical advice. See the medical disclaimer.